How does silicon sensor works and what is the advantage?
The silicon sensor obtains your fingerprint directly. It is like that you put ink on your finger, then press your finger on a piece of white paper. Your finger will leave a clear fingerprint image on paper. The technical mechanism of silicon sensor is as following: The surface of each pixel is composed of two adjacent metal plates, which are separated from the skin and the environment by an ultra-hard protective coating. These sensor plates create a fringing capacitance between them whose field lines extend beyond the surface of the silicon. When live skin is brought in close proximity to the sensor plates, the skin interferes with field lines between the two plates and reduces the effective capacitance between them. When the skin is on the sensor surface (fingerprint ridge) the feedback capacitance is minimized, while when the skin is far from the sensor surface (fingerprint valley) the feedback capacitance is maximized. This is why silicon sensor can obtain clear image. Therefore, th
